The answer is C but i don't know to get that answer, please explain. Thanks!
It is very simple. just look at the digit to the right of the digit at which you want to round off. if the digit is 5 or greater than five then you have the next digit or else leave it as it is .
In this case 1345/99 = 13.58585858585858
Since we want integer the digit just to the right is 5 so we have the nearest integer as 14.
Firstly we cannot round off a fraction we have to first convert it to a dedimal number and then round off. No we don't round off twice. In this case we are supposed to grounding off to unit place. The digit to the immediate right of unit digit is 5 and so the digit at units place is incremented by 1. OK.